Marisa Phiromtan และ Thongchai Mala. (2013) Effect of azotobacter application as nitrogen source on growth and yield of brockaleli (Brassica oleracea). Kasetsart University:ม.ป.ท.Marisa Phiromtan และ Thongchai Mala. 2013. Effect of azotobacter application as nitrogen source on growth and yield of brockaleli (Brassica oleracea). ม.ป.ท.:Kasetsart University;Marisa Phiromtan และ Thongchai Mala. Effect of azotobacter application as nitrogen source on growth and yield of brockaleli (Brassica oleracea). ม.ป.ท.:Kasetsart University, 2013. Print.